GENERAL HISTOLOGY

Detailed explanation-1: -Acetylcholine is the chief neurotransmitter of the parasympathetic nervous system, the part of the autonomic nervous system (a branch of the peripheral nervous system) that contracts smooth muscles, dilates blood vessels, increases bodily secretions, and slows heart rate.

Detailed explanation-2: -However, through the nicotinic cholinergic receptors, acetylcholine allows for skeletal muscle contraction; in the adrenal glands, the release of adrenaline and norepinephrine; and in the peripheral sympathetic ganglia, activation of the sympathetic system with the release of norepinephrine.

Detailed explanation-3: -In the peripheral nervous system, ACh is the neurotransmitter at the neuromuscular junction between the motor nerve and skeletal muscle. Distribution of cholinergic cell groups and projections in the rat brain.

Detailed explanation-4: -Acetylcholine is the neurotransmitter at neuromuscular junctions, at synapses in the ganglia of the visceral motor system, and at a variety of sites within the central nervous system.